<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div class="container">
        <ol>
            <li class="active"></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ol>
        

    </div>
</body>

<style>
    *{
        padding: 0;
        margin: 0;
        box-sizing: border-box;
    }
    .container{
        position: relative;
        width: 500px;
        height: 600px;
        margin: 100px auto;
        background-color: pink;
    }
    .container ol {
        position: absolute;
        display: flex;
        left: 50%;
        transform: translateX(-50%);
        bottom: 20px;
        /* border: 1px solid blue; */

    }
    .container ol li {
        height: 8px;
        width: 8px;
        border-radius: 4px;
        margin-left: 10px;
        background-color: aliceblue;
        list-style: none;
    }
    .container ol .active{
        background-color: orange;
    }
</style>

</html>